Refractory Anchor Assembly with Expansion Slots
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Solution Overview
Problem
Traditional refractory anchor assemblies fail to securely anchor monolithic refractory liners on vessel walls, especially in areas with high tension forces due to expansion and contraction issues, leading to cracking and spalling of the refractory material.
Innovation Solution
An anchor assembly comprising elongated plates with semi-circular recesses and expansion slots to prevent warpage and additional tabs for secure contact, allowing for better refractory material flow and reduced stress, enabling secure anchoring on angled surfaces and high-tension areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional V-shaped notches are used to anchor refractory material, then the anchor assembly can be secured to the vessel wall, but the temperature differential causes expansion and contraction that results in cracking and spalling of the refractory material
Solution Approach 1:
The patent replaces the traditional V-shaped notches with semi-circular recesses. The curved geometry of the semi-circular recesses eliminates the sharp angles that cause stress concentration during thermal expansion and contraction. This curvature allows the refractory material to bond smoothly without creating cracking planes, thereby maintaining anchoring strength while preventing refractory failure.
Solution Approach 2:
The patent modifies the geometric parameters of the anchor assembly by changing from angular V-shaped notches to rounded semi-circular recesses. This parameter change in the shape geometry fundamentally alters the stress distribution characteristics, eliminating the harmful stress concentrations that occur with sharp angles during temperature cycles.
2Strength
If square tabs with angular construction are used to provide additional support, then the anchor assembly can secure refractory lining, but the angular construction results in stress cracking around the edges of the tabs
Solution Approach 1:
The patent replaces the angular square tabs with rounded tabs that have curved edges. This curvature eliminates the sharp corners that act as stress concentration points during thermal cycling. The rounded geometry allows stress to distribute more evenly around the tab edges, preventing the formation of stress cracks while maintaining the tabs' load-bearing and securing functions.
3Strength
If solid edge is used to contact the vessel wall, then the anchor assembly can be secured by welding, but voids or pockets form in the refractory lining leading to future failures
Solution Approach 1:
The patent segments the solid edge into multiple smaller contact points or recesses along the edge. This segmentation allows the refractory material to flow into and bond with the vessel wall at multiple locations, eliminating large voids or pockets. The divided geometry maintains welding capability while ensuring continuous refractory coverage and eliminating defect-prone areas.
4Ease of operation
If conventional anchor assemblies are used in high tension force areas, then the anchor assembly can be installed, but the temperature differential causes warpage that propagates cracks in the refractory material
Solution Approach 1:
The patent incorporates expansion slots into the anchor assembly design that accommodate thermal expansion and contraction. These slots allow the metal anchor assembly to expand and contract freely during temperature cycles without developing warpage. By providing controlled expansion pathways, the design prevents the differential thermal stress that would otherwise cause the anchor to warp and crack the bonded refractory material.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The anchor assembly effectively reduces cracking and spalling of refractory liners by accommodating temperature differentials and providing additional support, ensuring a continuous monolithic lining without voids or defects.
Implementation Method 1
The temperature differential between the hot face and the cold face may result in expansion and contraction of the anchor assembly
Implementation Method 2
Refractory liners have been used for many years in process vessels, reactors, conduits, furnaces and the like to provide thermal insulation
Implementation Method 3
to provide resistance to abrasion and erosion, which are typically operated at elevated temperatures
Data Source
AI summary
An anchor assembly for anchoring refractory materials is disclosed for use in high tension stress applications. The anchor assembly includes at least one elongated plate having expansion slots formed along one edge of the elongated plate and semi-circular recessed formed along an opposing edge of the plate.